# Unlock the Box! St. Patrick’s Day Math {Addition & Subtraction with Regrouping}

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Unlock the Box! is an engaging math challenge for St. Patrick’s Day, with an addition and subtraction with regrouping focus. A Leprechaun named Lenny has locked a prize inside of a box, and students must solve his clues and find the key to unlock the box!

In the first series of clues, students solve story problems focusing on addition and subtraction with regrouping, leading to a password, which is needed to receive the final page of clues. In the final page of clues, students must solve additional addition and subtraction problems to help them decipher a puzzle, revealing the location of the key. Once students find the key, they’ll unlock the box and share Lenny’s prize with the entire class!

I provide you with:
• the note from Leprechaun Lenny to set the scene
• ideas for prizes including a collectible ribbon/bookmark (collect them all!) and a sheet of homework passes
• paper lock, key, and straps to secure the box containing the prize (Don't worry about it being made of paper: Lenny warns that the prize will self-destruct if anyone tries to tamper with the lock without the correct key. However, you could also use a real lock and key with a box secured with a chain.)
• Clues with addition/subtraction story problems (about Lenny) and clever puzzles that students must solve in order to ultimately find the location of the hidden key (*Three difficulty levels of all clues are given. See below for details.)
• Step-by-step, detailed instructions on how to set up the materials, including: preparing the prize box, hiding the key (two specific options provided), setting out the clues, and leading the activity.

All you provide is a box that closes (like a shoe box or storage bin).

The math focus in this activity is addition and subtraction with regrouping. Three versions of the clues are provided, each at a different level of difficulty. The challenge is intended to be done in partnerships and without calculators, to practice these math skills.
Version A (grade 3) is the least challenging: all addition and subtraction to be done is “within 1,000” (all numbers/answers are three-digits or less); regrouping is needed often.
Version B (grade 3/4) is more challenging: most addition and subtraction to be done uses 3 and 4 digit numbers (a few instances of 5 digit numbers); regrouping is needed often.
Version C (grades 4/5) is the most challenging: most addition and subtraction to be done uses 4 and 5 digit numbers (a few instances of 6 digit numbers); multiple instances of regrouping within the same problem.

**NOTE: This resource is NOT editable.**

Check out the full line of my Unlock the Box! activities:
Unlock the Box for the End of the Year
• More to come!!

**For personal and single classroom use only. If using with multiple classrooms, please purchase additional licenses at the discounted rate.**

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Total Pages
20+
Included
Teaching Duration
1 hour
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